:root {
    --bg-dark: #0f172a;
    --bg-darker: #020617;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --card-bg: #1e293b;
    --border: #334155;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: radial-gradient(circle at center, #1e293b 0%, #020617 100%);
}

.hero h1 {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(to right, #60a5fa, #a78bfa);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.bio {
    max-width: 600px;
    margin: 0 auto 2rem;
    color: var(--text-secondary);
}

.cta-group {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-primary {
    background-color: var(--accent);
    color: white;
}

.btn-primary:hover {
    background-color: var(--accent-hover);
}

.btn-secondary {
    border: 1px solid var(--border);
    color: var(--text-primary);
}

.btn-secondary:hover {
    border-color: var(--text-secondary);
}

/* Sections */
section {
    padding: 5rem 0;
}

.section-dark {
    background-color: var(--bg-darker);
}

.section-light {
    background-color: var(--bg-dark);
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    text-align: center;
}

/* About Grid */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

@media (max-width: 768px) {
    .about-grid {
        grid-template-columns: 1fr;
    }
    .hero h1 {
        font-size: 2.5rem;
    }
}

.about-text p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    color: var(--text-secondary);
}

/* Skills Grid */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.skill-card {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 0.75rem;
    border: 1px solid var(--border);
    text-align: center;
    transition: transform 0.3s ease;
}

.skill-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent);
}

.skill-card i {
    font-size: 2rem;
    color: var(--accent);
    margin-bottom: 1rem;
}

.skill-card h3 {
    margin-bottom: 0.5rem;
}

.skill-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Projects Grid */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.project-card {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 1rem;
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.card-header {
    margin-bottom: 1rem;
}

.tag {
    font-size: 0.75rem;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    text-transform: uppercase;
    font-weight: 700;
    margin-bottom: 0.5rem;
    display: inline-block;
}

.tag.enterprise { background-color: rgba(59, 130, 246, 0.2); color: #60a5fa; }
.tag.passion { background-color: rgba(16, 185, 129, 0.2); color: #34d399; }
.tag.research { background-color: rgba(139, 92, 246, 0.2); color: #a78bfa; }
.tag.active { background-color: rgba(245, 158, 11, 0.2); color: #fbbf24; }
.tag.flagship { background-color: rgba(236, 72, 153, 0.2); color: #f472b6; border: 1px solid rgba(236, 72, 153, 0.5); }

.project-card h3 {
    font-size: 1.5rem;
    margin-top: 0.5rem;
}

/* Mermaid Diagram */
.mermaid-container {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 1rem;
    border: 1px solid var(--border);
    overflow-x: auto;
    display: flex;
    justify-content: center;
}

.mermaid {
    width: 100%;
    max-width: 900px;
}

.project-card p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tech-stack span {
    background-color: var(--bg-darker);
    padding: 0.25rem 0.75rem;
    border-radius: 0.25rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

/* Contact */
.contact-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.contact-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 1.2rem;
    transition: color 0.3s ease;
}

.contact-btn:hover {
    color: var(--accent);
}

/* Footer */
footer {
    padding: 2rem 0;
    text-align: center;
    color: var(--text-secondary);
    border-top: 1px solid var(--border);
    margin-top: 2rem;
}

/* Utility Grids */
.philosophy-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.philosophy-card {
    padding: 2.5rem 2rem;
    background: linear-gradient(145deg, var(--card-bg), rgba(30, 41, 59, 0.5));
    border: 1px solid rgba(59, 130, 246, 0.1);
    display: flex;
    flex-direction: column;
    align-items: center;
    height: 100%;
}

.philosophy-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 10px 30px -10px rgba(59, 130, 246, 0.3);
    border-color: var(--accent);
}

.icon-wrapper {
    width: 60px;
    height: 60px;
    background: rgba(59, 130, 246, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    transition: all 0.3s ease;
}

.philosophy-card:hover .icon-wrapper {
    background: var(--accent);
    transform: scale(1.1);
}

.philosophy-card:hover .icon-wrapper i {
    color: white;
}

.philosophy-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.philosophy-card p {
    font-size: 1rem;
    line-height: 1.6;
}

@media (max-width: 900px) {
    .philosophy-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .philosophy-grid {
        grid-template-columns: 1fr;
    }
}